Kohlrabi 'Kolibri' (Kolibri kohlrabi) care

Light

Kohlrabi 'Kolibri' needs sun on the leaves, not just bright ambient room light. Full sun, at least 6 hours of direct light daily. In hot spells light afternoon shade slows bolting; too little light gives small, loose bulbs. A south or west-facing windowsill in the northern hemisphere is the default; anywhere else, expect the plant to stretch and pale out within a season.

Watering

Outdoor kohlrabi 'kolibri' crops want when top 2-3 cm of soil is dry, roughly every 3-5 days; aim for about 2.5 cm of water per week. The single best habit is a finger-test before watering — push a finger 3-4 cm into the soil. Damp = wait a day; dust-dry = water deeply at the base of the plant. Consistent moisture is critical. Uneven watering makes bulbs woody, cracked, or pungent. Mulch to buffer the root zone and never let plants wilt during bulb swell.

Soil and pot

Kohlrabi 'Kolibri' grows best in fertile, well-drained loam, ph 6.0-7.5. Wants firm, rich soil high in organic matter. Work in compost before planting. Keep pH near neutral; below 6.0 raises clubroot risk in this brassica. A pot with a working drainage hole is non-negotiable for this species — even free-draining mix will turn soggy in a closed planter. If you love the look of a decorative pot without a hole, use it as a cachepot around an inner nursery pot you can lift out to water.

Humidity and temperature

Kohlrabi 'Kolibri' sits happiest at around 40-70% humidity and 7-24°C (45-75°F). An outdoor field crop indifferent to ambient humidity; soil moisture matters far more than air moisture. Good airflow reduces downy mildew and leaf spot. If you keep the room above 7 year-round and avoid placing the plant near a cold draught, a hot radiator, or an air-conditioning vent, you have already handled the two biggest indoor stressors.

Fertilising

Feed kohlrabi 'kolibri' sparingly. Brassicas are heavy feeders. Work a balanced fertiliser into the bed at planting, then side-dress with nitrogen 3-4 weeks later. Avoid excess nitrogen late, which favours leaf over bulb. Skip fertiliser entirely on a stressed, recently-repotted, or actively wilting plant — fertiliser salts make damage worse, not better. Wait for a round of healthy new growth before resuming a feeding rhythm.

Common problems

Below are the issues we see most often on kohlrabi 'kolibri' in the Growli community. Each is annotated with the most common cause so you know where to start.

• Woody, fibrous bulbs — Caused by heat, age or erratic watering. Harvest at golf-to-tennis-ball size and keep moisture even to keep flesh tender.
• Bolting (premature flowering) — Triggered by cold snaps on young plants then heat, or late sowing. 'Kolibri' is bolt-resistant, but sow in cool weather and avoid transplant stress.
• Cabbage white caterpillars — Larvae of cabbage white butterflies shred the foliage. Net plants or inspect leaf undersides and remove eggs; Bacillus thuringiensis controls heavy infestations.
• Clubroot — Soil-borne disease swelling roots and stunting plants in acidic, wet ground. Rotate brassicas, improve drainage and lime to raise pH toward 7.0.

Propagation

Grown from seed. Direct sow 1 cm deep or start indoors and transplant young; thin or space 15-20 cm apart. Succession sow every 2-3 weeks in spring and again in late summer for autumn crops. Propagation is the cheapest, most satisfying way to expand a collection — and it doubles as insurance against losing a mature plant to an accident. Take a backup cutting once the parent is established and healthy.

Toxicity to pets

Kohlrabi 'Kolibri' is pet-safe. Kohlrabi (Brassica oleracea) is a cultivated vegetable not individually listed as toxic to cats or dogs by the ASPCA, and small amounts of cooked brassica are commonly fed to dogs. Large quantities of raw cruciferous matter can cause gas, GI upset and have goitrogenic effects, so offer only in moderation. If you keep cats, dogs, or curious children in the house, weigh placement carefully — a high shelf or a hanging planter is enough for casual safety. For severe ingestion incidents, call your local vet and the ASPCA Animal Poison Control Center (in the US, 888-426-4435).

Pet-safety status is sourced from the ASPCA Toxic and Non-Toxic Plant List, which catalogues the most-asked-about plants for cats, dogs, and horses.

Kohlrabi 'Kolibri' deep-dive guides

Every aspect of kohlrabi 'kolibri' care, each with its own calibrated guide:

• Kohlrabi 'Kolibri' watering schedule
• Kohlrabi 'Kolibri' light requirements
• Best soil mix for kohlrabi 'kolibri'
• Kohlrabi 'Kolibri' fertilizing guide
• When to repot kohlrabi 'kolibri'
• How to propagate kohlrabi 'kolibri'
• Kohlrabi 'Kolibri' growth rate & size
• Kohlrabi 'Kolibri' cold hardiness
• Kohlrabi 'Kolibri' temperature & humidity
• Is kohlrabi 'kolibri' toxic to cats & dogs?
• Is kohlrabi 'kolibri' toxic to cats?
• Is kohlrabi 'kolibri' toxic to dogs?

Related guides

Kohlrabi 'Kolibri' is also commonly called Kolibri kohlrabi or purple kohlrabi.

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